What are the units of torque?
Question 1: The kinetic energy of the system is
Answer: b, the same as Newtons * meters.
Question 2: A door is exactly 1 m wide. Fred pushes the center of the door with a force of 30 N. How much torque does Fred exert around the hinges of the door?
Answer: Torque = (lever arm) * (Force) = 0.5 meter * 30 N = 15 N*m Note that the CENTER of a door 1 m wide is only 0.5 m away from the hinges. Fred would exert a greater torque by pushing the side of the door opposite the hinges...
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